nfs lockd errors after NetApp software upgrade.

[Richard P Mackerras]

Hi,

We had some bully type workloads emerge when we moved a lot of block
storage from old XIV to new all flash 3PAR. I wonder if your IMAP issue
might have emerged just because suddenly there was the opportunity with all
flash. QOS is good on 9.x ONTAP. If anyone says it’s not then they last
looked on 8.x. So I suggest you QOS the IMAP workload.

 Nobody should be using UDP with NFS unless they have a very specific set
of circumstances. TCP was a real step forward.

Cheers

Richard